ADM8839ACP ,Charge Pump Regulator for Color TFT PanelGENERAL DESCRIPTION The ADM8839 has a power save shutdown feature. The 5 VThe ADM8839 is a charge p ..
ADM8843ACPZ-REEL7 ,4 White LED Backlight DriverGENERAL DESCRIPTION Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply The ADM8843 uses char ..
ADM8845ACP-REEL7 ,Charge Pump Driver for LCD White LED BacklightsSPECIFICATIONS (V = +2.6V TO 5.5V; TA = -40°C to 85°C unless otherwise noted; C1,C2 = 1.0µF; C ..
ADM8845ACPZ-REEL7 ,Charge Pump Driver for LCD White LED BacklightsFEATURES ADM8845 drives 6 LEDs from a 2.6 V to 5.5 V (li-ion) input The ADM8845 provides the power ..
ADM9240ARU ,Low Cost Microprocessor System Hardware Monitorspecifications are tested at logic levels of V = 0.3 × V for a falling edge and V = 0.7 × V for a r ..
ADM9264ARN ,Quad Power Supply Monitor for Desktop PCsSPECIFICATIONS (V = Full Operating Range, T = T to T unless otherwise noted)CC A MIN MAXParameter M ..
AIC809-46CUTR , 3-PIN MICROPROCESSOR RESET CIRCUITS
AIC809-46CUTR , 3-PIN MICROPROCESSOR RESET CIRCUITS
AIC810-44CUTR , 3-PIN MICROPROCESSOR RESET CIRCUITS
AIC810-44PUTR , 3-PIN MICROPROCESSOR RESET CIRCUITS
AIVR3K42 , APLUS INTEGRATED CIRCUITS INC
AK002M4-31 , GaAs MMIC Control FET in SOT 143 DC-2.5 GHz
ADM8839ACP
Charge Pump Regulator for Color TFT Panel
REV.A
Charge Pump Regulator
for Color TFT Panels
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe ADM8839 is a charge pump regulator used for color thin film
transistor (TFT) liquid crystal displays (LCDs). Using charge
pump technology, the device can be used to generate three
voltages (+5 V ±2%, +15 V, –15 V) from a single 3 V supply.
These voltages are then used to provide supplies for the LCD
controller (5 V) and the gate drives for the transistors in the
panel (+15 V and –15 V). Only a few external capacitors are
needed for the charge pumps. An efficient low dropout (LDO)
voltage regulator ensures that the power efficiency is high and
provides a low ripple 5 V output. This LDO can be shut down
and an external LDO can be used to regulate the 5 V doubler
output and drive the input to the charge pump section that
generates the +15 V and –15 V outputs, if required by the user.
FEATURES
3 Voltages (+5 V, +15 V, –15 V) from
a Single 3 V Supply
Power Efficiency Optimized for Use
with TFT in Mobile Phones
Low Quiescent Current
Low Shutdown Current (<5 �A)
Shutdown Function
Option to Use External LDO
APPLICATIONS
Hand-held Instruments
TFT LCD Panels
Cellular PhonesThe ADM8839 has a power save shutdown feature. The 5 V
output consumes the most power, so power efficiency is also
maximized on this output with an oscillator enabling scheme
(Green Idle™). This effectively senses the load current that is
flowing and turns on the charge pump only when charge needs
to be delivered to the 5 V pump doubler output.
The ADM8839 is fabricated using CMOS technology for minimal
power consumption. The part is packaged in a 20-lead LFCSP
(lead frame chip scale package).
ADM8839–SPECIFICATIONS
(VCC = 3 V – 10%, 40%; TA = –40�C to +85�C; C1, C5, C6, C7 = 2.2 �F; C2, C3,
C4, C8, C9 = 0.22 �F; unless otherwise noted.)
TIMING SPECIFICATIONSSpecifications are subject to change without notice.
(VCC = 3 V, TA = 25�C; C1, C5, C6, C7 = 2.2 �F; C2, C3, C4, C8, C9 = 0.22 �F.)+15 V OUTPUT
LDO_ON/OFF
*Guaranteed by design. Not 100% production tested.
Specifications are target values and are subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*(TA = 25°C, unless otherwise noted.)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +6.0 V
Input Voltage on Digital Inputs . . . . . . . . . . .–0.3 V to +6.0 V
Output Short-Circuit Duration to GND . . . . . . . . . . . . .10 sec
Output Voltage
+5 V Output . . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to 7.0 V
–15 V Output . . . . . . . . . . . . . . . . . . . . . . . .–17 V to +0.3 V
+15 V Output . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +17 V
Operating Temperature Range . . . . . . . . . . . .–40°C to +85°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 mW
Storage Temperature Range . . . . . . . . . . . . .–65°C to +150°C
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Class I
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ORDERING GUIDE
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM8839 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
THERMAL CHARACTERISTICS20-Lead LFCSP Package:
�JA = 31°C/W
ADM8839
PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
VCC 1
VOUT 2
LDO_IN 3
11 C3�
LDO_ON/
OFF
6
SHDN
7
8
GND 9
15VOUT 10�5VOUT 4
�5VIN 5
17
15VOUT
16 C4
PIN 1
INDICATOR
TOP VIEW
ADM8839
12 C3�
13 C2�
14 C2�
15 C4�
18 GND19 C1
20 C1TPC 1.LDO O/P Voltage Variation
overTemperature and Supply
ILOAD – mA
LDO O/P
GE –
5.02004681357TPC 2.LDO O/P Voltage vs. Load Current
ILOAD – �A
+15V/–15V PO
WER EFFICIENCY – %
1001050701009020406080TPC 3.+15 V/–15 V Power Efficiency vs. Load Current
TPC 4.LDO Power Efficiency vs. Load Current,
VCC = 3 V
SUPPLY VOLTAGE – V
SUPPL
Y CURRENT –
3.12.73.53.92.93.33.74.14.2TPC 5.Supply Current vs. Supply Voltage
ILOAD – �A
OUTPUT
E –
15.10100150200TPC 6.+15 V/–15 V Output Voltage vs. Load
Current, Typical Configuration
ADM8839TPC 7.+15 V and –15 V Outputs at Power-Up
TPC 8.Output Ripple on LDO (5 V Output)
TPC 9.5 V Output Transient Response,
Load Disconnected
TPC 10.Output Transient Response for
Maximum Load Current
TPC 11.+15 V and –15 V Outputs at Power-Down
